When a project is conducted with passion, the journey towards the end goal becomes an exciting adventure. And at Sisgeo, a company in the suburbs of Milan, passion is everything. “How the dragon conquered the subsoil” retraces the main stages of Sisgeo’s growth. It is a story of industry and passion, recounting the hard work of the company’s founders and of the managers, employees and collaborators who, over twenty-five years, have allowed the company to refine the design, production and sale - not to mention the culture - of instrumentation in the field of geotechnical and structural engineering. Its products have the most diverse applications, including the monitoring of dams, tunnels, buildings, bridges, viaducts, excavations and underground works. Over a quarter of a century, Sisgeo, established in 1993 and based in Masate, Milan, has conquered a large share of the international market, becoming a world leader in its field, with branches and subsidiaries in strategic locations throughout the world.